a 



c 



d 



Fig. 5. — Developmeutal stages of the lateral nasal gland of Ampbiuma. 

 Although some of these are from the right and others from the left side, the 

 drawings are so reversed as to give in each case the effect of a lateral view 

 of the glands of the right side, i. e., the dorsal region of the drawing is on 

 the right hand side, and the ventral on the left. X 45. Abbreviations are 

 explained in the text. 



a. 60 mm. specimen, lateral view of gland of the right side, based on mil- 

 limeter paper reconstruction from transverse serial sections. 



b. 78 nun. specimen, lateral view of glands of left side (reversed), based 

 on millimeter paper reconstructions from transverse serial sections. 



c. 80 mm. specimen, internal view of glands of right side (reversed), from 

 dissection. , 



d. 80 mm. specimen, internal view of glands of the left side, from dis- 

 section. 



e. 150 mm. specimen, lateral view of glands of left side (reversed), based 

 on reconstruction by the millimeter paper method from transverse serial 

 sections. 



f. 190 mm. specimen, lateral view of glands of the right side, based upon 

 reconstructions by various methods. The posterior half of the larger gland 

 possesses several tubules which are hidden from view. 



